50 Fittest Female Athlete in the World with Bonus (Instagram)

46. Kacy Catanzaro / AMERICAN NINJA WARRIOR

At 5-foot and 100 pounds, former Division I gymnast Catanzaro proved that size doesn’t matter when she became the first woman to finish the American Ninja Warrior obstacle course and qualify for the finals. To remain light, lean and lightning-quick, Catanzaro sticks to bodyweight circuit training and, of course, practices the AMW obstacles, such as the famous Warped Wall.